Air-brake for motor-cars.



I. CHUM. AIR BRAKE FOR MOTOR CARS.

APPLICATION F lLED lULY 21.1914.

Patented. June 8, 1915.

2 SHEETS-SHEET I- mvv/Moz WWI/Lama I. CRUM.

AIR BRAKE FOR MOTOR CARS.

APPLICATION FILED JULY 2I, I914.

Patented June 8, 1915.

2 SHEETS-SHEET 2.

amuewtoz pninp rarnnr ni rcn IRVIN DRUM, OF SELMA, ALABAMA.

AIR-BRAKE FOR lVITOR-CARS.

il,ietil,939.

Application filed July 21, 1914.

To all whom it may concern Be it known that I, IRVIN CRUM, a citizen ofthe United States, residing at Selma, in the county of Dallas and Stateof Alabama, have invented new and useful Improvement in Air-Brakes forMotor-Cars, of which the following is a specification.

This invention relates to air brakes for motor-cars or vehicles, theobject of the invention being to provide simple, practical and reliableapparatus adapted to be used in connection with any present dayautomobile or other motor vehicle, whereby the operator, by a simplepressure on a pedal is enabled to effect the application of the brake orbrakes by means of compressed air, the air being automatically stored ina reservoir or tank by and during the operation of the engine of themotorcar.

With the above and other objects in view, the invention consists in thenovel construction, combination and arrangement of parts,

as herein described, illustrated and claimed.

In the accompanying drawings :Figure l is a bottom plan view of theframe of a motorcar, showing a sufiicient portion of the mechanismthereof to identify and illustrate the construction and relation of thepresent invention thereto. Fig. 2 is a vertical longitudinal sectionthrough the same. l ig.

is an enlarged detail longitudinal section through the air brake,cylinder and parts intimately associated therewith.

Referring to the drawings 1 designates an air compressor or pump whichis geared to and driven directly by the engine of a motoroar, suchengine being conventionally shown at A.

2 designates a storage tank or reservoir which is connected With thepump to receive the air therefrom by means of a pipe 3 equipped with aback pressure check valve 4. The tank has associated therewith apressure gage 5 and a safety valve 6 and said tank or reservoir 2- isconnected by means of a pipe 7 with the receiving end of an air brakecylinder 8 in which is a reciprocatory piston 9.

In axial alinemcnt with the cylinder 8 is a spring containing cylinder10, the cylinders 8 and 10 being connected in fixed relative positionsby means of a slotted yoke 11. The piston rod 12 extends from the piston9 through the yoke 11 into the cylinder 10 where it is acted upon by apiston returning spring 13 which, as soon as a relief valve 14Specification of Letters Patent.

Patented June 8, was.

Serial No. 852,216.

is operated in the cylinder 8, returns the piston'9 to its position ofrest. The relief valve 14 is shown as operated by means of a pedal 15. p

16 designates a. 'alve for admitting pres sure from the tank 2 to thecylinder 8, said valve being shown as controlled by the pedal 17 l8designates an air vent in the cylinder 10 to allow for the movement ofthe plunger 19 carried by the end of the piston rod.

Connected to and carried by the piston rod 12 is a cross arm 20 andparallel to said cross arm is a rock shaft 21, the cross arm and rockshaft being connected at opposite sides of and equidistantly from thepiston rod by means of toggle arms 22 and 23. l nder the arrangementshown and described, as the cross arm 20 is moved by the piston rod, thearms 22 and serve to rock the shaft 21 and operate the connections whichapply and release the brake or brakes.

In the usual arrangement of brakes on a motorcar, external contractingand internal expanding brake bands or shoes are used in. connection witheach of the rear driving wheels 24, said bands or shoes cotiperatingwith the drums 25 carried by said wheels. In order to provideconnections which will operate these brake bands, I provide two sets ofconnections 26 and 2-7 as shown in Fig. 1, said connections beingoperated by corresponding sets of arms 28 and 29 on a countershaft 30mounted to oscillate in bearings on the machine frame. The shaft 30 isoperatively connected by means 31 to a relatively shorter rock shaft 32connected by arms 33 and 34: and rods 35 and 36 to arms 37 and 38 on theshaft 21 hereinabove described. The ordinary foot brake lever 39 isconnected by a rod 40 to another arm 41 on the shaft 32 to providemanual appli cation of the brakes as wellas the pneumatic application.An air pressure gage &2 may also be provided upon the cylinder 8 so thatthe operator may observe the amount of air pressure therein at any time.

From the foregoing description, taken in connection with theaccompanying drawings it will now be understood that the operator bypressing on the pedal 17 admits air from the storage tank or reservoir 2to the brake cylinder 8, resulting in the application of the brake orbrakes. To release the brakes, he presses on the other pedal 15 andopens the relief valve 14 allowing the spring in the cylinder 10 toreturn the piston to its initial position of rest. Should there beinsufiicient pressure of air in the tank 2, the brakes may be applied inthe usual way by means of the lever 39.

The brake mechanism ,hereinabove described may be applied to newmachines as they are built at the factory or to machines already in use.

\Vhat I claim is 1 Air brake apparatus for motor cars, comprising an airpump, a compressed air storage tank, a brake cylinder in communicationwith said tank, a spring-containing cylinder in axial alinement with thebrake cylinder, a slotted yoke connecting said cylinders in fixedrelative positions, a piston in the brake cylinder, a piston rodextending therefrom into the spring-containing cylinder, a spring in thelast named cylinder which acts on the piston rod to return the piston toits posi- IRVIN CRUM. Witnesses:

CHAs. 1. Morris, JEROME LEVA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0'.

